Automatically-threading loom shuttle



Jy 9, 1929. H. A. DAvls 1,720.41()

AUTOMATICALLY THREADING Loon SHUTTLE Filed Sept. 27, 1928 .Emy/Ms .aan e, ieaa nanna" a navrs, or nor-unam, MASSACHUSETTS, assrenon 'ro generen cerraro- MTIUN, F HOPEDALE, MASSACHUSETTS, A GORPRATIN F MMWR.

AUTOMATIGALLY-THREADING LOM vSIHU'Il."l.l'.|]l.

Application filed september 2l', 1928. Serial No.. 308,724.

lllhis invention relates to automatically threading loom shuttles wherein the filling supply in the shuttle is changed from time to time.

llt is now the ordinary practice in weaving with automatic looms of the filling replenishing type to provide a series of filling carriers with'wound filling thereon and contained in a hopper or supply. The ends of the filling are usually secured to some fixed part, so that on the first pick of the shuttle following repleninshment the shuttle will becomepartially threaded and on thel return pick of the shuttle to the filling replenishing shuttle box M it will usually become fully threaded. lt

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may happen at times during the weaving opT eration, also, that the filling thread may be thrown out of the side delivery eye and the.

shuttle become partially unthreaded.

ln order that perfect clothmay be woven, the filling that is delivered from the shuttle should be maintained under uniform tension, but since the filling thread does not lead through the side delivery eye of the shuttle on the first pick following replenishment, and is liable to be thrown out of the side delivery eye during weaving, tension on the thread is liableto vary,'.being less when the thread is not delivered through the side deo livery'eye. y

in important feature ofthe present invention consists in providing an automatically threading loom shuttle with means to insure uniforiutension 4on the thread whether it be delivered through the side delivery eye or not. More specifically stated, -the present invention provides athread tension device preferably adjacent the entrance of the longitudinal thread passage'and a hook which extends downwardly into the thread `passage from the top thereof, and is provided at its lower portion well down in the longitudinal passage with a thread leading eye below the top of the tensionin device so that both runs of the thread may los directed through the tensioning device when the shuttle is partially threaded to thereby compensate for the loss.

of tension usually exerted upon the thread when delivered from the side delivery eye.

rlhe invention and novel features thereof will best be made clear from the following description and the accompanying drawings of one good form thereof.

ln the drawings:

n Fig. 1 is a plan view of an automatically threading shuttle containing the present inventlon and showin more particularly the thread delivering end of the shuttle;

Fig. 2 is a detached perspective view of a threading block provided with the presenti invention and showing both leads of the thread passing through the ktension device when the shuttle is partially threaded;

Fig. 3 is an enlarged section on the line 3-3 of Fig. 1; and

Fig. 4 is a longitudinal section of the threading bloclr.

The shuttlel islprovided with the usual side delivery eye 1X and bobbin chamber 2 in which a lfilling'carrier 3 containing the supn ply of filling is detachably mounted. 'lhe detachable mounting of the lling carrier or bobbin 3 is not herein shown because it forms no essential part of the present invention and may be of the usual type of bobbin holding Jaws.`

Frontward of the bobbin chamber the shuttle is provided with a threading bloclr receiving recess in which the threading bloclr l is mounted and in which it is held by the usual cross-bolt passing through an opening 5 of the block. i

'lhe threading bloclr l is provided with the longitudinal thread passage 6 and at the entrance portion of the thread passage is a thread tensioning device, which, in the present instance of the invention, comprises the two tensioning members 7 and 8 which may be appropriately mounted in the threading block at the entrance portion'thereof by a pin 9 permitting movement ofthe tensioning' members towards and from each other.

The tensioning members 'l and 8 extend upwardly and the upper ends thereof are flared outward at 10 and 11. 'llhe front wall l 12 and the baclr wall l?) of the threading upwardly and outwardly inclined end portions 10 and 11 of the tensioning members into a position between the two.

In the present instance of the invention, the threading block is provided with the seats 15 and 16, one at each side of the longitudinal thread passage, to accommodate the tensioning members 7 and 8 and to also provide the recesses 14'for thereception of the upwardly and 'outwardly flaring ends of the tensioning members, and, as indicated more `clearly in Fig. 3, the open sockets `or seats '14 have their .upper edges 17 slightly above the outwardly Haring ends o f the-tensioning members, lto thereby insure that the filling ence of spring means for normally l1`0lding\ them in their tensioning position, and, as shown 1n the present instance of the Invention, a spring 18 which 1s seated l1n a recess I 19 of the threading block bears upon the tensioning membcr7 while the'o osinof tensioning member 8 rests against the end of a threaded adiusting boltV 20 which passes through the `back wall 13 of the threading block and is threaded into a block 2l with respect to which it may be adjusted lengthwise by turning the'bolt. The bolt may be conveniently turned by an instrument engaging the slot 22 of the bolt and a locking nut 23 may be provided to hold the parts in adjusted position. From t-he construction thus far described it will be apparent that the present invention contemplates a thread tensioning device preferably of the spring clamp type at oradjacent the longitudinal thread passage 6, to act upon the thread during weaving and to impart the requisite tension thereto.

At the forward `end of the thread passage 6 is the bridge 24 over which the thread passes on its way to the side delivery eye. The bridge 24, in the present instance of the invention, is. shown as formed of vitreous material and the filling thread which passes over the bridge dips down under the arch 25 of the threading'block on its way to the side delivery eye.

Exetending downwardly in a curved direction into the longitudinal passage 6 of the threading block from the front wall thereof is a hook 26, the lower portion of which is provided with a thread leading'eye 27 opening upwardly, and the end portion of the hook 26 within the longitudinal passage reaches frontwardly at 28 preferably over the bridge 24, as more clearly indicated in Fig. 4.

The thread leading eye 27 opens upwardly as at 29 and is formed between the bulge 30 on the frontwardly reaching portion of the hook and the downwardly curved edge portion 31 of the hook, the construction being such that the thread leading eye is well down in the longitudinal thread passage and below the top of the thread tensioning device hereinbefore described, with the result that should the thread be not delivered from the shuttle through the side delivery eye as the `of the thread passage, over thebridge 24,

under the arch or guide 25 of the threading block and be delivered from the side delivl ery eye. This lead of the thread during normal weaving will cause it to be tensioned by the tensioning device and also by its tortuous course over the bridge laterally to the side delivery eye, but when the shuttle fails to be fully threaded, the tensioning effect of the bridge and tortuous lead of the thread to the -side delivery eye is, of course, lost and to compensate for this loss of tension, the thread leading eye 27 of the hook 26 directs the delivering portion of the thread, as a, as well as the'supply end a through the tension device, with the result that the lost tension due to the tortuous course of the thread to the side delivery eye is compensated by both leads of the thread passing through the tensioning device, thereby insuring uniform tension on the thread Whether the shuttle be fully or only partially threaded.

What is claimed is: i

1. An automatically threading loom shuttle having a longitudinal thread passage and side delivery eye, a thread tension device adjacent the entrance to the longitudinal thread passage, an intermediate hook extending downwardly from the top of the thread passage between the tension device and exit end of the thread passage and provided at its lower portion with a thread lead below the top of the tension device and positioned so that a partially threaded thread will loop about the hook in a manner to cause both the forward and return runs of the thread to be directed through the tension device to maintain substantially the same uniform tension on the thread as when the shuttle is completely threaded.l

2. An automatically threading loom shuttle having a side delivery eye and a threadin block provided with a longitudinal threa passage, a tension device mounted in the threading block adjacent the entrance to the thread passage, a hook curved downwardly from the top of the block into the thread passa e between the tension device and side de ivery eye and having at its lower end a thread lead for engaging the thread when it fails to be delivered from the side delivery eye and positioned so that the partially threaded thread will loop about the hook in a manner to cause hoth the forward and return runs of the thread to pass through the tension device to compensate for the loss of tension normally exerted by the delivery of the thread from the side delivery eye.

3. An automatically threading loom shuttle having a side delivery eye, a threading block having a longitudinal thread passage, a spring clamp tension device mounted in the threading block at the entrance of the longitudinal thread passage, a thread leading hook curved downwardly from one side of the threading block into the thread passage and having a thread leading eye opening upwardly lfrom the lower part of the hook within the thread passage for engaging the thread when it fails to be delivered through the side delivery eye and positioned to cause both the supply and delivery runs of the thread to pass through the spring clamp tension device to maintain uniform tension on the thread.

d. An automatically threading loom shuttle having a side delivery eye, a threading block having a longitudinal thread passage, a spring clamp tension device mounted in the threading block at the entrance of the longi tudinal thread passage, a thread leading hook curved downwardly from the top of the front wall of the threading block into the thread passage and having a thread leading eye opening upwardly from the lower part of the hook within the thread passage for engaging the thread when it fails to be delivered through the side ldelivery eye and positioned to cause both the supply and delivery runs of the thread to pass through the spring clamp tension device to maintain uniform tension on the thread.

5. An automatically threading loom shuttle having a side delivery eye and longitudinal thread passage, a spring clamp tension device at the entrance to the thread passage, a hook extending downwardly into the thread passage frontward of the tension device and reaching frontward in the lower part of the thread passage, a thread leading eye at the vthread passage, a tension device adjacent the entrance to the thread passage, a hook curved downwardly from one side of the thread passage and having a thread lead in the lower part of the thread passage and positioned to cause both runs of the thread looped about the hook to be subjected to the action ot' the tension device and maintain uniform tension on the thread when it fails to be delivered y from the side delivery eye.

7 An automatically threading loom shuttle having a side delivery eye and longitudinal thread passage, a tension device adjacent the entrance to the thread passage, a bridge at the exit end of the thread passage, and a hook extending downwardly into the thread passage and positioned to cause both runs of the thread looped about the hook to be subjectedl to the control of the tension device When the shuttle is partially unthreaded to maintain uniform tension on the thread.

8. An automaticallythreading loom shuttle having a side delivery eye and longitudinal thread passage, a tension devi-ce adjacent the entrance to the thread passage, a bridge at the exit end of the thread passage, anda hook extending downwardly into the thread passage withv its end reachine` frontwardly above the bridge and positioned to cause both runs of the thread looped about the hook to be subjected to the control of the tension device wlien the shuttle is partially unthreaded to maintain uniform tension on the thread.

Intestilnony whereof, I have signed my name to this specication.

HARRY A. DAVIS. 

